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Activity Points Item Type
Classes and Object-Oriented Programming
1.1 Introduction to Classes and Objects Lesson
1.1.1 What is a Class? 1 Video
1.1.2 Quiz: Classes and Objects 1 Quiz
1.1.3 The Rectangle Class 1 Example
1.1.4 The Point Class 1 Example
1.1.5 The Student Class 1 Example
1.1.6 Using the Rectangle Class 5 Exercise
1.1.7 Calling A Method 5 Exercise
1.1.8 Using the Point Class 5 Exercise
1.1.9 Using the Student Class 5 Exercise
1.2 Classes vs. Objects Lesson
1.2.1 Classes and Objects 1 Video
1.2.2 Classes vs. Objects vs. Instances 1 Quiz
1.2.3 Classes, Objects, and Instances 1 Example
1.2.4 Creating Rectangle Objects 1 Example
1.2.5 Text Messages 5 Exercise
1.3 Using a Class as a Client Lesson
1.3.1 How to Use a Class 1 Video
1.3.2 Quiz: Client of a Class 1 Quiz
1.3.3 Using the Rectangle Class as a Client 1 Example
1.3.4 Using the Randomizer Class as a Client 1 Example
1.3.5 Coin Flips 5 Exercise
1.3.6 Longest Streak 5 Exercise
1.3.7 Testing the GeoLocation Class 1 Example
1.3.8 How Far Away is ...? 5 Exercise
1.4 Writing Classes Lesson
1.4.1 Constructors 1 Video
1.4.2 Quiz: Constructors 1 Quiz
1.4.3 Student Constructor 1 Example
1.4.4 Rectangle Constructor 1 Example
1.4.5 Triangle Class: Constructor 5 Exercise
1.4.6 Rectangle toString 1 Example
1.4.7 Student toString 1 Example
1.4.8 toString for Flowers 5 Exercise
1.4.9 Instance Variables for Your Dog 5 Exercise
1.4.10 Student GPA Field 5 Exercise
1.4.11 Free Response: What instance variables? 5 Free Response
1.4.12 Pizza Time! 5 Exercise
1.4.13 Fractions 5 Exercise
1.5 Writing Classes and Instance Methods Lesson
1.5.1 Writing Instance Methods 1 Video
1.5.2 Quiz: Writing Methods 1 Quiz
1.5.3 Area of a Rectangle 1 Example
1.5.4 Moving a Point 1 Example
1.5.5 Writing getPerimeter() 5 Exercise
1.5.6 Honors Students 5 Exercise
1.5.7 The Full Triangle Class 5 Exercise
1.5.8 Batting Average 5 Exercise
1.5.9 Distance in Kilometers 5 Exercise
1.6 Getter and Setter Methods Lesson
1.6.1 Getter and Setter Methods 1 Video
1.6.2 Quiz: Getter and Setter Methods 1 Quiz
1.6.3 Rectangle Getter Methods 1 Example
1.6.4 Student Getter Methods 1 Example
1.6.5 Text Messages Getter Methods 5 Exercise
1.6.6 Fractions Getter/Setter Methods 5 Exercise
1.6.7 Full Fraction Class 5 Exercise
1.7 Class Methods and Class Variables Lesson
1.7.1 Static Methods and Variables (Class Methods and Class Variables) 1 Video
1.7.2 Quiz: Static Methods 1 Quiz
1.7.3 Student Class Variables and Methods 1 Example
1.7.4 Using the Math Class 1 Example
1.7.5 Using Randomizer 1 Example
1.7.6 Static Variables: Circle 1 Example
1.7.7 The Unit Circle 5 Exercise
1.7.8 How Many Players in the Game? 5 Exercise
1.7.9 Circle Area, another way 5 Exercise
1.7.10 Rock, Paper, Scissors: Get Winner 5 Practice
1.7.11 Rock, Paper, Scissors! 5 Exercise
1.8 Method Overloading Lesson
1.8.1 Method Overloading 1 Video
1.8.2 Method Overloading Quiz 1 Quiz
1.8.3 Sum Method Overloading 1 Example
1.8.4 Constructor Overloading 1 Example
1.8.5 Product Method Overloading 5 Exercise
1.9 Local Variables and Scope Lesson
1.9.1 Local Variables and Scope 1 Video
1.9.2 Local Variables and Scope Quiz 2 Quiz
1.9.3 Instance Variable Scope 1 Example
1.9.4 Local Variable Scope 1 Example
1.9.5 Variable Shadowing 1 Example
1.9.6 Which Variables Exist? 5 Exercise
1.10 Key Terms for Classes Lesson
1.10.1 Key Terms for Classes 1 Video
1.10.2 Quiz: This Keyword 1 Quiz
1.10.3 Rectangles and this 1 Example
1.10.4 Batteries 5 Exercise
1.10.5 Write Your Own CodeHS 5 Exercise
1.11 Objects vs Primitives Lesson
1.11.1 Objects vs Primitives 1 Video
1.11.2 Objects vs Primitives Quiz 2 Quiz
1.11.3 Comparing Rectangles 1 Example
1.11.4 Changing Dogs 1 Example
1.11.5 Null Pointer Exception 1 Example
1.11.6 Objects vs Primitives 5 Free Response
1.11.7 Comparing Circles 5 Exercise
1.12 Inheritance Lesson
1.12.1 Inheritance 1 Video
1.12.2 Quiz: Subclasses and Superclasses 1 Quiz
1.12.3 Square is a Rectangle 1 Example
1.12.4 Finding The Perimeters 5 Exercise
1.13 Class Design and Abstract Classes Lesson
1.13.1 Class Design and Abstract Classes 1 Video
1.13.2 Quiz: Class Design 1 Quiz
1.13.3 The Shape Hierarchy 1 Example
1.13.4 Classes for Dessert 1 Example
1.13.5 Clothing Store 5 Exercise
1.14 Polymorphism Lesson
1.14.1 Polymorphism 1 Video
1.14.2 Quiz: Polymorphism 1 Quiz
1.14.3 Animal Sounds 1 Example
1.14.4 Shape Areas 1 Example
1.14.5 Fun with Solids 10 Exercise
1.15 Interfaces Lesson
1.15.1 Interfaces 1 Video
1.15.2 Quiz: Interfaces 1 Quiz
1.15.3 Comparable Interface 1 Example
1.15.4 Summable Interface 1 Example
1.15.5 Fraction is Comparable 5 Exercise
1.15.6 City is Summable 5 Exercise
1.15.7 Classes and Object-Oriented Programming Badge 1 Badge
1.16 Unit 4 Quiz Lesson
1.16.1 Unit 4 - Classes and Object-Oriented Programming 18 Quiz
Data Structures
2.1 What are Data Structures? Lesson
2.1.1 What are Data Structures? 1 Video
2.1.2 Quiz: Data Structures 1 Quiz
2.1.3 Data Structures Everywhere 4 Free Response
2.2 Introduction to Arrays Lesson
2.2.1 Introduction to Arrays 1 Video
2.2.2 Quiz: Arrays 1 Quiz
2.2.3 Making an Array 1 Example
2.2.4 Make an Empty Array 1 Example
2.2.5 Indexing Into an Array 1 Example
2.2.6 Our First Array 5 Exercise
2.2.7 Array Length 5 Practice
2.2.8 Last Element in Array 5 Practice
2.3 Using Arrays Lesson
2.3.1 Using Arrays 1 Video
2.3.2 Quiz: Using Arrays 1 Quiz
2.3.3 Iterating Over an Array 1 Example
2.3.4 Sum Array 1 Example
2.3.5 Array Out of Bounds 1 Example
2.3.6 Print Array 5 Exercise
2.3.7 Print Odd Array Indices 5 Exercise
2.3.8 Find the Minimum Index 5 Practice
2.3.9 Classroom Example 1 Example
2.3.10 Exam Scores 1 Example
2.3.11 Array References 1 Example
2.3.12 Find the Median 5 Practice
2.3.13 Top Student 5 Exercise
2.4 ArrayList Methods Lesson
2.4.1 ArrayLists 1 Video
2.4.2 Quiz: ArrayList 1 Quiz
2.4.3 Hello World ArrayList 1 Example
2.4.4 ArrayList and Java Primitives 1 Example
2.4.5 ArrayList Size Method 1 Example
2.4.6 Get First Element 5 Exercise
2.4.7 Reading List 1 Example
2.4.8 Texting in Class 1 Example
2.4.9 Road Trip! 5 Exercise
2.5 Arrays vs ArrayLists Lesson
2.5.1 Arrays vs ArrayLists 1 Video
2.5.2 Quiz: Arrays vs ArrayList 1 Quiz
2.5.3 Expanding Array 1 Example
2.5.4 Improving Expanding Array 5 Exercise
2.5.5 Array vs ArrayList 1 Example
2.6 The List Interface Lesson
2.6.1 The List Interface 1 Video
2.6.2 The List Interface Quiz 1 Quiz
2.6.3 Reverse the List 1 Example
2.6.4 Summer Reading 7 Practice
2.7 2D Arrays (Matrices or Grids) Lesson
2.7.1 2D Arrays 1 Video
2.7.2 Quiz: 2D Arrays 1 Quiz
2.7.3 Nested Loops 1 Example
2.7.4 Ice Cream Combos 5 Practice
2.7.5 First 2D Array 1 Example
2.7.6 Initializing a 2D Array 1 Example
2.7.7 The Matrix 1 Example
2.7.8 Sum Rows in a Matrix 7 Practice
2.8 HashMaps Lesson
2.8.1 HashMaps 1 Video
2.8.2 Quiz: HashMaps 1 Quiz
2.8.3 The Phonebook 1 Example
2.8.4 Word Counts 10 Exercise
2.9 Binary Lesson
2.9.1 Number Systems 1 Video
2.9.2 Number Systems Quiz 3 Quiz
2.9.3 Converting Octal to Decimal 1 Example
2.9.4 Converting Binary to Decimal 7 Practice
2.9.5 Using Binary 1 Video
2.9.6 Using Binary Quiz 2 Quiz
2.9.7 Integer Limits 1 Example
2.9.8 Binary Translator 7 Practice
2.10 Writing BlackJack Lesson
2.10.1 The Card Class 1 Video
2.10.2 The Card Class 1 Example
2.10.3 The Deck Class 1 Video
2.10.4 The Deck Class 1 Example
2.10.5 The Hand Class 1 Video
2.10.6 The Hand Class 1 Example
2.10.7 The Blackjack Class 1 Video
2.10.8 The Blackjack Game 1 Example
2.10.9 Improving Blackjack 10 Exercise
2.10.10 Data Structures Exercises Badge 1 Badge
2.11 Battleship Lesson
2.11.1 Battleship Demo 1 Video
2.11.2 Battleship Part 1: The Ship Class 5 Exercise
2.11.3 Battleship Part 2: The Location Class 5 Exercise
2.11.4 Battleship Part 3: The Grid Class 7 Exercise
2.11.5 Battleship Part 4: Adding a Ship to the Grid 6 Exercise
2.11.6 Battleship Part 5: The Player Class 5 Exercise
2.11.7 Battleship Part 6: The Battleship Class 5 Exercise
2.11.8 Battleship Part 7: Finishing the Game 10 Exercise
2.11.9 Battleship Extensions 7 Exercise
2.11.10 Battleship Badge 1 Badge
2.12 Unit Quiz Lesson
2.12.1 Unit 5 - Data Structures 23 Quiz
Final Project
3.1 Final Project Lesson
3.1.1 Brainstorm 5 Free Response
3.1.2 Milestones 5 Free Response
3.1.3 Final Project 10 Exercise
3.1.4 Final Project Badge 1 Badge
3.2 Intro Java Completed Lesson
3.2.1 Intro Java Badge 1 Badge
Algorithms and Recursion
4.1 What is an Algorithm? Lesson
4.1.1 What is an Algorithm? 1 Video
4.1.2 Every Day Algorithms 5 Free Response
4.2 Linear Search Lesson
4.2.1 Linear Search 1 Video
4.2.2 Linear Search 1 Example
4.2.3 Linear Search on ArrayList 5 Practice
4.2.4 Gradebook FRQ 1 Resource
4.3 Binary Search Lesson
4.3.1 Binary Search 1 Video
4.3.2 Binary Search 2 Check for Understanding
4.3.3 Binary Search 1 Example
4.3.4 Comparing Binary Search and Linear Search 5 Exercise
4.3.5 Binary Search Badge 1 Badge
4.4 Selection Sort Lesson
4.4.1 Selection Sort 1 Video
4.4.2 Selection Sort 1 Check for Understanding
4.4.3 Selection Sort 1 Example
4.4.4 Visualizing Algorithms 1 Example
4.4.5 Explore Selection Sort 5 Exercise
4.5 Insertion Sort Lesson
4.5.1 Insertion Sort 1 Video
4.5.2 Insertion Sort 1 Check for Understanding
4.5.3 Visualizing Algorithms 1 Example
4.5.4 Insertion Sort 1 Example
4.5.5 Explore Insertion Sort 5 Exercise
4.6 Advanced: Recursion Lesson
4.6.1 Recursion 1 Video
4.6.2 Factorial 1 Example
4.6.3 Factorial Unit Test Example 5 Practice
4.6.4 Recursion Walkthrough 5 Video
4.6.5 Recursion Example 5 Example
4.6.6 Recursive Binary Search 5 Example
4.6.7 Fibonacci Recursive 1 Example
4.6.8 Bacteria Cultures 10 Practice
4.6.9 Recursive Minimum 10 Practice
4.7 Mergesort Lesson
4.7.1 Mergesort 1 Video
4.7.2 Visualizing Algorithms 1 Example
4.7.3 Merge Sort 1 Example
4.7.4 Explore Merge Sort 5 Exercise
4.7.5 Algorithms Badge 1 Badge
4.8 Informal Code Analysis Lesson
4.8.1 Informal Code Analysis 1 Video
4.8.2 Informal Code Analysis 7 Check for Understanding
4.8.3 Loop Execution Count 1 Example
4.8.4 While Loop Time 1 Example
4.8.5 For Loop Time 1 Example
4.8.6 Time Comparisons 5 Free Response
4.8.7 Improving isChar Speed 5 Exercise
4.8.8 Improving isChar Speed Check 1 Example
4.8.9 isChar Speed Reflection 5 Free Response
4.9 Algorithms and Recursion Quiz Lesson
4.9.1 Algorithms and Recursion Quiz 19 Unit Quiz
Project: Pokemon Simulation
5.1 Pokemon Simulation Lesson
5.1.1 Pokemon Demo 1 Video
5.1.2 The Move Class 10 Challenge
5.1.3 The Pokemon Class 10 Challenge
5.1.4 Adding Pokemon Images 10 Challenge
5.1.5 Pokemon can Attack! 10 Challenge
5.1.6 The PokemonTrainer Class 10 Challenge
5.1.7 The PokemonSimulation Class 10 Challenge
5.1.8 Finishing the Battle 10 Challenge
5.1.9 Adding the ComputerTrainer 10 Challenge
5.1.10 Pokemon Extensions 10 Challenge
5.1.11 Pokemon Badge 0 Badge
Project: Mad Libs
6.1 Mad Libs Lesson
6.1.1 Mad Libs Demo 1 Video
6.1.2 Collecting the Placeholders 10 Challenge
6.1.3 Getting User Input 10 Challenge
6.1.4 Replacing a Placeholder 10 Challenge
6.1.5 Generating the Mad Lib 10 Challenge
6.1.6 Write your own Mad Lib! 10 Challenge
6.1.7 Mad Lib Extensions 10 Challenge
Java Outside of CodeHS
7.1 Java Outside of CodeHS Lesson
7.1.1 Java Outside of CodeHS 1 Video
7.1.2 Hello World in Eclipse 1 Video
7.1.3 Hello World in BlueJ 1 Video
7.1.4 Hello World in Terminal 1 Video
7.1.5 Java main vs run 1 Video
7.1.6 Using the main Method in Eclipse 1 Video
7.1.7 Using the main Method in BlueJ 1 Video
7.1.8 Using the main Method in the Terminal 1 Video
7.1.9 Hello World with main Method 1 Example
7.1.10 Getting User Input 1 Video
7.1.11 Using Scanner for Input 1 Example
Project: Quiz Creation
8.1 Quiz Creation Lesson
8.1.1 Quiz Demo 1 Video
8.1.2 The Question Class 10 Challenge
8.1.3 Question toString 10 Challenge
8.1.4 The Quiz Class 10 Challenge
8.1.5 Using the QuizFileReader Class 10 Challenge
8.1.6 Constructing Quizzes from Files 10 Challenge
8.1.7 The QuizRunner Class 10 Challenge
8.1.8 Write your own Quiz! 10 Challenge
8.1.9 Quiz Extensions 10 Challenge
Computer Ethics
9.1 Computer Ethics Lesson
9.1.1 Student Honor Code 0 Resource
9.1.2 Computing Ethics 0 Resource
9.1.3 Self Driving Cars 5 Free Response
Java Pretest
10.1 Java Pretest Lesson
10.1.1 About the Pretest 1 Notes
10.1.2 Mindsets 0 Survey
10.1.3 Knowledge & Skills: Java 15 Quiz
Java Posttest
11.1 Java Posttest Lesson
11.1.1 About the Posttest 1 Notes
11.1.2 Mindsets 0 Survey
11.1.3 Java Knowledge & Skills 15 Quiz